brownish grey blotches on leaves - nute burn?? please help!!

[jdubz206]

I'm not sure what this is... my guess is nute burn. I've got a variety of strains. 1 ogk mother and 1 chemd x mendo bb clone are currently showing brownish grey dry blotches on a couple of fan leaf blades per plant. is this nute burn? if it is nute burn, would a good tap water flush help? I started giving 1 of the clones a bit of nutes because I got it from a buddy and it was looking like it was lacking N. I just give them my usual veg mix of 1 tbsp fish emulsion, 1 tsp bio-bloom, and .25 tsp floralicious +. Any suggestions would be greatly






thanks,
j206

 

[1love1earth]

I've started to see stuff similar to this on my plants too, check out my thread in the infirmary.

Not sure if it's the same cause, but it looks similar.

 

[evilunclephil]

What are your temps? It looks like heat stress to me.

 

[jdubz206]

1love - thanks. i will.

evilunclephil - i seriously doubt it's heat stress. the temps in my veg cab have been between 65-75. i've seen similar spots before on plants in my flower room where temps never get above 77.

i was thinking nute burn. i've never had nute burn or any other deficiencies (that I know of). i've been growing for about a year now and have had these spots on and off.

anyone else ever see anything like this?

 

[1love1earth]

IMO nute burn gets over diagnosed by new growers, just a theory. IE, nute burn may be rampant, but what you're dealing with could easily be a nute deficiency.

For instance, I see the yellow leaf with red branch stem, to me, I've been seeing that as well, having some lower growth die off, just old baby fan leaves dying off, turning yellow, and eventually bleached yellow, and dropping off.

That is likely indicative of not nute burn, but nitrogen deficiency. Thus perhaps if we're underfeeding on nitrogen, we're just generally underfeeding? Could be a P or K deficiency causing the spots.

Also, I may be wrong, but I've got a theory, assuming the plant is the same size, that plant in a smaller container will require a more concentrated (or higher EC/PPM) feeding than the same plant in a larger container. My reasoning behind this theory is that there is physically more medium in the larger container, be it soil, or coco, and thus when we water in our nutes, there are physically more nutes available to the plant, and it will take longer to eat all of them.

While smaller potted plants (again assuming they are the same size plant) are going to drink and eat the available nutrients and water much more quickly, the roots have less overall "nutrient saturated medium" at their disposal to eat from.

I've also seen folks claim use of much higher EC's on mature plants in smaller pots, like clone mom's, or SOG.

Thus if my theory (and it may already be a "given" for most) is correct, pot size really must be taken into account when feeding, and diagnosing issues.

Just food for thought.

 

[acidnI_livE]

i rep you for that one IloveEarth- that is extremely good info.

alot of time post size is not considered at all when diagonsing somethinglike these spots. like just cuz i feed my i gallon plant the same ec as my three gallon plant and the three gallon one os fine but the i gallone is showing def. in some nute. cuz the medium is less and there for less food is retained in the pots.

think of the soil/soilless mixes we use as actual "hydroponic resorvoirs" cuz esentially they hold enough water for the plant for a couple days and then the resorvoir (soil,soiless mixes) needs refilled with food and water. like promix growers who use hydro nutes, that is actually considered "hydroponic growing", with the promix acting as the resorvoir. and you are giving the plant what it needs through traditional hydro nutes. technically it a hydro grow.
my $.02

 

[jdubz206]

i'm going to up the fish emulsion a bit and see what happens.

 

[DIGITALHIPPY]

didnt i post here saying it was a ph issue? my post seams to have vanished.

 

[HeadyPete]

Looks lie a P def, but you are feeding P, so perhaps, as the DigiHippy stated, you have ph issues causing some lockout.

 

[BudLove]

Most certainly a pH lockout issue.

Take a look at ALL the pics verified as true nute burn... you'll notice a very quick trend in ALL of them.... the leaves turn DARK DARK GREEN. Nute burn is seriously obvious.

Nute lockout is also very easy to spot - as the leaves will NOT be dark green and will begin spotting or striping. This indicates that the plant is using stored nutrients in its leaves to feed itself - since it's not getting fed properly from the hydro/soil.

BL